S-91255A544 1/4"-20 x 1 1/4" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in harsh industrial environments
• Exceptional mechanical strength with 120,000 psi tensile strength and Rockwell C39 hardness for heavy-duty applications
• Precision thread engagement with Class 3A fit ensuring reliable fastening and vibration resistance
• Easy installation and removal with 5/32" hex drive design providing secure tool engagement
• Low-profile rounded head design offering flush mounting while maintaining high torque capability
• Full threading coverage along the 1-1/4" length for maximum grip and load distribution
• Industry compliance assurance meeting ASME, ASTM, RoHS 3, and REACH standards for quality and safety

Professional Applications & Engineering Value

These 1/4-20 UNC hex drive button head screws deliver critical performance advantages in demanding industrial settings. The black-oxide alloy steel construction provides enhanced corrosion protection where environmental factors threaten fastener integrity. With Class 3A thread fit and coarse threading, these fasteners ensure rapid assembly while maintaining precision alignment in machinery, automotive, and heavy equipment applications. The combination of 120,000 psi tensile strength and Rockwell C39 hardness makes them ideal for high-stress connections subject to vibration and dynamic loads. The rounded head profile with hex drive allows for both aesthetic flush mounting and efficient torque application, solving common challenges in confined spaces while meeting rigorous industry standards.

Specification Summary & Compliance

Manufactured to exacting Class 3A thread fit tolerances with UNC coarse thread spacing and right-hand threading. These fully threaded screws maintain dimensional accuracy per ASME B18.3 and ASTM F835 specifications. Compliance verified with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets. The 1/4"-20 thread size with 1-1/4" length provides standardized compatibility while the black-oxide surface treatment enhances durability without compromising dimensional integrity.